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`private (set) state: State`

VoiceControlSample-iOS/VoiceControlSample/VoiceControl/VoiceStateView/VoiceStateView.swift

Line 15 in e09372a

private(set) var state: State = .attending

지난 세미나를 매우 흥미롭게 보아 코드를 보던 중, state: State가 private set이 되는 것으로 보여 질문드립니다.
외부에서stateView의 state를 확인하기 위함으로 보이는데, stateMachine에 있는 currentState를 이용한

internal extension VoiceStateView {
    enum State: RawRepresentable {
        
        case attending, detecting, listening, processing, reporting
        
        var rawValue: GKState.Type {
            switch self {
            case .attending:
                return AttendingState.self
            case .detecting:
                return DetectingState.self
            case .listening:
                return ListeningState.self
            case .processing:
                return ProcessingState.self
            case .reporting:
                return ReportingState.self
            }
        }
        
        init?(rawValue: GKState.Type) {
            switch rawValue {
            case is AttendingState.Type:
                self = .attending
            case is DetectingState.Type:
                self = .detecting
            case is ListeningState.Type:
                self = .listening
            case is ProcessingState.Type:
                self = .processing
            case is ReportingState.Type:
                self = .reporting
            default:
                return nil
            }
        }
        
    }
}

...

var state: State? {
        guard let currentState = self.stateMachine.currentState else {
            return nil
        }
        return State(rawValue: type(of: currentState))
}